Here're steps:
1.Click All Items -> Format current view -> Advanced mode.
2.Add following codes.
{
"$schema": "https://developer.microsoft.com/json-schemas/sp/view-formatting.schema.json",
"additionalRowClass": "=if([$Status] == 'open', 'sp-field-severity--good', 'sp-field-severity--blocked')"
}
3.Result.
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